2. Five drugs for high blood pressure were studied for their ability to reduce systolic blood pressure levels. Here are the mean reductions found with treatment groups of 100 people each. These means represent the drop in blood pressure from the beginning of the study. There was a significant ANOVA, and the minimum significant difference at p ≤ 0.05 was 1.8 mm Hg. In the following table, assign letters to indicate which means are different. Use the letter a for the numerically highest mean but that mean may not be different from other means!
Drug Mean reduction in systolic blood pressure Letter indicating significance
Atenolol 8.5
Furosemide 4.0
Lisinopril 4.2
Losartan 5.9
Pindolol 3.8